0.5.0 on my N800:

1) When I'm on the ASUI screen with an app open, and press Home key, I get the system Home menu overlaying the second screen and it remains in place as I switch between ASUI screens. The menu can't be cleared or activated until ASUI screen is closed.

2) Remain Lit When Charging is not working: the display continues to dim, then blank, after the timeout. The setting on the ASUI 2nd screen mirrors/changes the setting in the Display Control Panel. I've rebooted a couple of times, just in case, with this setting set each way at shutdown; no luck.

3) Once #2 is resolved, you probably want to update:
http://asui.garage.maemo.org/blanking.html